ISO 13250-2: Topic Maps — Data Model

ISO 13250-2: Topic Maps — Data Model is part 2 of ISO 13250,
the topic maps standard, and defines a formal data model for topic
maps, which will be used to define the XML topic map syntax (XTM), and
also be the foundation for the query language (TMQL) and the schema
language (TMCL). It is often known by its acronym: TMDM. (In case you
are wondering, yes, it used to be known as the SAM, or Standard
Application Model.)

At the moment both TMDM and XTM 2.0 are ISO standards, purchasable
from the ISO shop. This means they are both officially finished and
stable. Corrections have been made to TMDM since publication; see
below for details.

Related links are:

The
guide to the topic maps standards, which explains what is
currently happening with the topic map standards. This should help you
understand what the TMDM is and how it will be used. (Note: That
document refers to it as the SAM and is slightly out of date.)

The
topic map standards topic map, which contains lots of useful
background information on the TMDM draft, and the issues with it.
(If you want a local copy, just use the "Export" link at the top
of the page.)